鸢尾属杂交育种研究概况

正鸢尾属(Iris L.)约有植物260余种,广泛分布于亚洲的中国、中东、欧洲、北美洲及北非等地,生境多样,在草甸、沼泽地、干旱草原、丘陵、高低海拔山地等均有分布。随着鸢尾属物种的不断被发现和开发,鸢尾属植物逐渐被广泛应用于生态环境建设、切花生产、医疗、日用化工等多个领域。鸢尾属植物研究主要集中在杂交育种、系统进化、花色、生态学等方面。鸢尾属植物在形态学、结构学、孢粉学、细胞学、分子生物学等方面,都进行过系统分类。其中Mathew(1981)基于形态学的分类系统被广为接受,该系统将鸢尾属分为6个     

彩虹女神Iris

正"鸢尾"一词往往泛指鸢尾属植物,而鸢尾属Iris是鸢尾科Iridaceae中最大属。全世界约有鸢尾300种,我国产64种、8变种1亚种及6变型,主要分布于西南、西北及东北。鸢尾的园艺品种数目更是惊人,根据2016年有关数据统计,全球鸢尾品种已经超过2 000个。鸢尾的生境多样,在草甸、沼泽、草原、丘陵、高低海拔山地等均有分布。随着鸢尾属物种的不断被发现和开发,鸢尾属植物逐渐被广泛应用于生态环境建设、切花生产、医疗、日用化工等多个领域。     

鸢尾属主要园艺类群及其应用

正1735年,林奈以德国鸢尾(I. germanica L.)为模式种首次创建了鸢尾属(Iris L.),该属也是鸢尾科(Iridaceae)中最大的属。全世界总计有野生鸢尾属植物280～300种,它们主要分布于北半球的欧亚大陆和北美地区。目前,鸢尾属中约有100个原种参与了杂交选育,获得的园艺品种已超过7万个,其中以有髯鸢尾、路易斯安那鸢尾、西伯利亚鸢尾、花菖蒲、琴瓣鸢尾和荷兰鸢尾等园艺类群最为有名。鸢尾作为一类世界著名的宿根花卉,其文化底蕴深厚、株型优美、花型奇特、花色     

荷兰鸢尾的景观应用

正荷兰鸢尾为球茎类鸢尾属植物,这一点是它与园林上应用的其他根茎类鸢尾属园艺类群最大的不同。荷兰鸢尾花期在江南地区恰逢"五一",是春天最美丽的花朵之一,这使得这类鸢尾备受关注,是目前鸢尾类花卉中栽培与应用较广的一类球根花卉。荷兰鸢尾发展背景由球根鸢尾中的西班牙鸢尾亚属(Subgenus Xiphium)部分种杂交获得了一个类群名为西班牙鸢     

糖果鸢尾里的秘密

正在鸢尾属植物的育种研究中,远缘杂交是获得鸢尾新性状的重要育种方法,比如西伯利亚鸢尾和路易斯安那鸢尾都是通过远缘杂交的方法不断获得新品种。1967年Samuel Norris通过野鸢尾与射干杂交后获得了一个品种群,后人将这类鸢尾称为Candy lily,中文名译作糖果鸢尾。糖果鸢尾的花朵娇小,单花花期只有一天,但因其如糖果般色彩斑斓的花色而逐渐被世人熟悉。     

糖果鸢尾优良新品种

正鸢尾属(Iris)的植物花姿奇特,花色艳丽丰富,栽培历史悠久,在园艺界久负盛名。经过园艺工作者们多年来不懈的努力,到目前为止,在美国鸢尾协会中登陆的鸢尾园艺品种数已达七万多种。由于其种类繁多,因此在园林中应用的形式也比较多样。其中许多矮生种及品种可以与岩生植物及高山植物相结合,构成岩石园;也可以将不同园艺品种进行种植设计,组成鸢     

养花门诊

问：听说有一种常绿的水生鸢尾,不知是哪种鸢尾,又怎样繁殖与养护？答：常绿的水生鸢尾称路易斯安娜鸢尾,又称六棱鸢尾,在分类上归鸢尾属、无髯鸢尾亚组、六棱鸢尾系。     

辰山植物园鸢尾园

鸢尾是鸢尾科、鸢尾属宿根草本花卉,在欧美受欢迎程度仅次于月季,在日本已有近500年栽培历史。鸢尾种类繁多,全世界原种约300种,加上各种园艺品种,总计已达3万多种。鸢尾适应性广、管理粗放。鸢尾专类园是鸢尾在园林应用中最为常见的形式。     

英国切尔西花展上的多年生花卉

每年5月下旬,世界级的园艺盛会——切尔西花展就会在英国伦敦如期举行。来自世界各地的园艺爱好者和专业人士云集在这里,尽情地欣赏这个由英国皇家园艺学会主办、拥有80多年悠久历史的花展。展览会上,参展商纷纷展示各类园林花卉新品种,包括乔灌木、鲜切花、兰花、多浆植物、热带花卉、水生植物、蔬菜瓜果、香草、藤本植物、食虫植物等,其中深受英国人喜爱的多年生花卉(Perennials)更加突出,既有展示球根花卉或宿根植物多品种的综合性大展位,又有专门展示像玉簪属、鸢尾属、报春花属等专类植物的特别展位。整体给人留下眼花缭乱、目不暇给的感觉。这里仅管中窥豹地介绍一些新品种,藉以了解国外较高园林花卉育种和栽培水平。     

国际流行花卉系列新品鸢尾Iris

鸢尾为鸢尾科、鸢尾属多年生花卉。约200种,分布北温带,我国原产约45种。鸢尾在我国久经栽培,可以广泛地应用于园林绿地、花境及作地被。许多低矮的种类,耐阴性、耐寒性强,宜栽培于排水良好的土壤。近年来新品迭出,主要出自于:     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.